Malicious PDF — malware analysis report

Static analysis result for SHA-256 eac73efc3ef53406…

MALICIOUS

PDF

100.7 KB Created: 2021-09-13 12:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ed99b48d165ce9ad4065e7edcaa3cab1 SHA-1: 6a9bdf3001f8d886c8bb189d3cf27c37303b2e7c SHA-256: eac73efc3ef53406cd79ca68b96d13ecfac22bdb68ac7d3081301519054dbb5f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to deliver malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://panziofabian.hu/fck_kepek/81011118366.pdf In PDF document text
    • http://riverhouse.at/pcms/content/file/89326241245.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/54177657748.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/bebefikupuv.pdfIn PDF document text
    • http://teakdeck.pl/files/file/nukinus.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/nijef.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e775e4bdba---xiporigipunapudomedeba.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/nekikerimivovogoju.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/watirusomivak.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/mipojiloxexosix.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/39597729962.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/62847522825.pdfIn PDF document text
    • https://stvorki.ru/files/file/16447521064.pdfIn PDF document text
    • http://bastola.org/userfiles/file/8850289733.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/kisuresipaje.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/99257656541.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/diluderowalixitazajixuju.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/fojabejewutaxazidi.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/zipugavidabusa.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b547e6b273---wizezigaruriregik.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/67487891908.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/32720777218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=baldi%27s+basics+2d+androidPDF link annotation
    • https://scratch.mit.edu/In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001256c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256C 18600 bytes
SHA-256: 18643f333e07244feb0c790d8ff40c0c722bc45657bcbd40233eb18c214c62cc
font_01_sfnt_off000155e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155E2 10480 bytes
SHA-256: d4c79394ba80751b56471ebf3d4215b252d1b3d2df91d96b3e351b163c701344
font_02_sfnt_off00016ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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